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magnetoencephalography & depression

Yagna Pathak, Oludamilola Salami, Sylvain Baillet, Zhimin Li, Christopher R Butson
BACKGROUND: Major depressive disorder (MDD) is a public health problem worldwide. There is increasing interest in using non-invasive therapies such as repetitive transcranial magnetic stimulation (rTMS) to treat MDD. However, the changes induced by rTMS on neural circuits remain poorly characterized. The present study aims to test whether the brain regions previously targeted by deep brain stimulation (DBS) in the treatment of MDD respond to rTMS, and whether functional connectivity (FC) measures can predict clinical response...
2016: Frontiers in Neural Circuits
Benjamin T Dunkley, Elizabeth W Pang, Paul A Sedge, Rakesh Jetly, Sam M Doesburg, Margot J Taylor
BACKGROUND: Post-traumatic stress disorder (PTSD) is associated with atypical responses to emotional face stimuli with preferential processing given to threat-related facial expressions via hyperactive amygdalae disengaged from medial prefrontal modulation. METHOD: We examined implicit emotional face perception in soldiers with (n = 20) and without (n = 25) PTSD using magnetoencephalography to define spatiotemporal network interactions, and a subsequent region-of-interest analysis to characterize the network role of the right amygdala and medial prefrontal cortex in threatening face perception...
January 2016: Heliyon
Allison C Nugent, Stephen E Robinson, Richard Coppola, Carlos A Zarate
Functional neuroimaging techniques including magnetoencephalography (MEG) have demonstrated that the brain is organized into networks displaying correlated activity. Group connectivity differences between healthy controls and participants with major depressive disorder (MDD) can be detected using temporal independent components analysis (ICA) on beta-bandpass filtered Hilbert envelope MEG data. However, the response of these networks to treatment is unknown. Ketamine, an N-methyl-D-aspartate (NMDA) receptor antagonist, exerts rapid antidepressant effects...
August 30, 2016: Psychiatry Research
Anthony G Hudetz, George A Mashour
A quest for a systems-level neuroscientific basis of anesthetic-induced loss and return of consciousness has been in the forefront of research for the past 2 decades. Recent advances toward the discovery of underlying mechanisms have been achieved using experimental electrophysiology, multichannel electroencephalography, magnetoencephalography, and functional magnetic resonance imaging. By the careful dosing of various volatile and IV anesthetic agents to the level of behavioral unresponsiveness, both specific and common changes in functional and effective connectivity across large-scale brain networks have been discovered and interpreted in the context of how the synthesis of neural information might be affected during anesthesia...
June 21, 2016: Anesthesia and Analgesia
Bankim S Chander, Matthias Witkowski, Christoph Braun, Stephen E Robinson, Jan Born, Leonardo G Cohen, Niels Birbaumer, Surjo R Soekadar
BACKGROUND: Frontal midline theta (FMT) oscillations (4-8 Hz) are strongly related to cognitive and executive control during mental tasks such as memory processing, arithmetic problem solving or sustained attention. While maintenance of temporal order information during a working memory (WM) task was recently linked to FMT phase, a positive correlation between FMT power, WM demand and WM performance was shown. However, the relationship between these measures is not well understood, and it is unknown whether purposeful FMT phase manipulation during a WM task impacts FMT power and WM performance...
2016: Frontiers in Cellular Neuroscience
Peter Zwanzger, Anna Luisa Klahn, Volker Arolt, Tillmann Ruland, Maxim Zavorotnyy, Johannes Sälzer, Katharina Domschke, Markus Junghöfer
In major depressive disorder (MDD), electrophysiological and imaging studies provide evidence for a reduced neural activity in parietal and dorsolateral prefrontal regions. In the present study, neural correlates and temporal dynamics of visual affective perception have been investigated in patients with unipolar depression in a pre/post treatment design using magnetoencephalography (MEG). Nineteen in-patients and 19 balanced healthy controls passed MEG measurement while passively viewing pleasant, unpleasant and neutral pictures...
April 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
David E Nichols
Psychedelics (serotonergic hallucinogens) are powerful psychoactive substances that alter perception and mood and affect numerous cognitive processes. They are generally considered physiologically safe and do not lead to dependence or addiction. Their origin predates written history, and they were employed by early cultures in many sociocultural and ritual contexts. After the virtually contemporaneous discovery of (5R,8R)-(+)-lysergic acid-N,N-diethylamide (LSD)-25 and the identification of serotonin in the brain, early research focused intensively on the possibility that LSD and other psychedelics had a serotonergic basis for their action...
April 2016: Pharmacological Reviews
Kun Bi, Lingling Hua, Maobin Wei, Jiaolong Qin, Qing Lu, Zhijian Yao
BACKGROUND: Dynamic functional-structural connectivity (FC-SC) coupling might reflect the flexibility by which SC relates to functional connectivity (FC). However, during the dynamic acute state change phases of FC, the relationship between FC and SC may be distinctive and embody the abnormality inherent in depression. This study investigated the depression-related inter-network FC-SC coupling within particular dynamic acute state change phases of FC. METHODS: Magnetoencephalography (MEG) and diffusion tensor imaging (DTI) data were collected from 26 depressive patients (13 women) and 26 age-matched controls (13 women)...
February 2016: Journal of Affective Disorders
Shuichi Isomura, Toshiaki Onitsuka, Rikako Tsuchimoto, Itta Nakamura, Shogo Hirano, Yuko Oda, Naoya Oribe, Yoji Hirano, Takefumi Ueno, Shigenobu Kanba
BACKGROUND: The auditory steady-state response (ASSR) elicited by gamma band neural oscillations has received considerable interest as a biomarker of psychiatric disorders. Although recent ASSR studies have reported that patients with bipolar disorder (BD) show altered ASSRs, little is known about ASSRs in patients with major depressive disorder (MDD). The aim of this study was to evaluate whether ASSRs in MDD subjects differed from those in BD subjects or normal controls (NC). METHOD: We analyzed ASSRs in 14 MDD patients, 19 BD patients, and 29 normal control subjects...
January 15, 2016: Journal of Affective Disorders
Robert Wunderlich, Pia Lau, Alwina Stein, Alva Engell, Andreas Wollbrink, Claudia Rudack, Christo Pantev
Tinnitus, the ringing in the ears that is unrelated to any external source, causes a significant loss in quality of life, involving sleep disturbance and depression for 1 to 3% of the general population. While in the first place tinnitus may be triggered by damage to the inner ear cells, the neural generators of subjective tinnitus are located in central regions of the nervous system. A loss of lateral inhibition, tonotopical reorganization and a gain-increase in response to the sensory deprivation result in hypersensitivity and hyperactivity in certain regions of the auditory cortex...
2015: PloS One
Sumie Kurita, Yuichi Takei, Yohko Maki, Suguru Hattori, Toru Uehara, Masato Fukuda, Masahiko Mikuni
AIMS: Although affective and/or attention modulation of somatosensory processing has been well studied, the biological bases of somatic symptoms in patients with major depressive disorder (MDD) have rarely been examined. To elucidate changes in somatosensory processing underlying somatic symptoms in patients with MDD, we conducted a magnetoencephalography study of patients with MDD and healthy controls. METHODS: After median nerve stimulation, somatosensory evoked fields (SEF) were recorded in 10 patients with MDD and 10 sex-, age-, and height-matched healthy volunteers under somatosensory attending, visually attending, and non-attending conditions...
February 2016: Psychiatry and Clinical Neurosciences
Elisabeth A Wilde, Sylvain Bouix, David F Tate, Alexander P Lin, Mary R Newsome, Brian A Taylor, James R Stone, James Montier, Samuel E Gandy, Brian Biekman, Martha E Shenton, Gerald York
Traumatic brain injury (TBI) remains one of the most prevalent forms of morbidity among Veterans and Service Members, particularly for those engaged in the conflicts in Iraq and Afghanistan. Neuroimaging has been considered a potentially useful diagnostic and prognostic tool across the spectrum of TBI generally, but may have particular importance in military populations where the diagnosis of mild TBI is particularly challenging, given the frequent lack of documentation on the nature of the injuries and mixed etiologies, and highly comorbid with other disorders such as post-traumatic stress disorder, depression, and substance misuse...
September 2015: Brain Imaging and Behavior
Katharina Domschke, Peter Zwanzger, Maimu A Rehbein, Christian Steinberg, Kathrin Knoke, Christian Dobel, Isabelle Klinkenberg, Harald Kugel, Anette Kersting, Volker Arolt, Christo Pantev, Markus Junghofer
BACKGROUND: In major depressive disorder (MDD), electrophysiological and imaging studies suggest reduced neural activity in the parietal and dorsolateral prefrontal cortex regions. In the present study, neural correlates of emotional processing in MDD were analyzed for the first time in a pre-/post-treatment design by means of magnetoencephalography (MEG), allowing for detecting temporal dynamics of brain activation. METHODS: Twenty-five medication-free Caucasian in-patients with MDD and 25 matched controls underwent a baseline MEG session with passive viewing of pleasant, unpleasant, and neutral pictures...
February 2016: International Journal of Neuropsychopharmacology
Amy S Badura-Brack, Katherine M Becker, Timothy J McDermott, Tara J Ryan, Madelyn M Becker, Allison R Hearley, Elizabeth Heinrichs-Graham, Tony W Wilson
Posttraumatic stress disorder (PTSD) is a severe psychiatric disorder prevalent in combat veterans. Previous neuroimaging studies have demonstrated that patients with PTSD exhibit abnormal responses to non-threatening visual and auditory stimuli, but have not examined somatosensory processing. Thirty male combat veterans, 16 with PTSD and 14 without, completed a tactile stimulation task during a 306-sensor magnetoencephalography (MEG) recording. Significant oscillatory neural responses were imaged using a beamforming approach...
August 30, 2015: Psychiatry Research
Alexander D Shaw, Neeraj Saxena, Laura E Jackson, Judith E Hall, Krish D Singh, Suresh D Muthukumaraswamy
At subanaesthetic doses, ketamine, an N-methyl-d-aspartate (NMDA) receptor antagonist, has demonstrated remarkable and rapid antidepressant efficacy in patients with treatment-resistant depression. The mechanism of action of ketamine is complex and not fully understood, with altered glutamatergic function and alterations of high-frequency oscillatory power (Wood et al., 2012) noted in animal studies. Here we used magnetoencephalography (MEG) in a single blind, crossover study to assess the neuronal effects of 0...
August 2015: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
Allison C Nugent, Stephen E Robinson, Richard Coppola, Maura L Furey, Carlos A Zarate
UNLABELLED: Functional magnetic resonance imaging (fMRI) studies have revealed the existence of robust, interconnected brain networks exhibiting correlated low frequency fluctuations during rest, which can be derived by examining inherent spatio-temporal patterns in functional scans independent of any a priori model. In order to explore the electrophysiological underpinnings of these networks, analogous techniques have recently been applied to magnetoencephalography (MEG) data, revealing similar networks that exhibit correlated low frequency fluctuations in the power envelope of beta band (14-30Hz) power...
September 2015: NeuroImage
Benjamin T Dunkley, Paul A Sedge, Sam M Doesburg, Richard J Grodecki, Rakesh Jetly, Pang N Shek, Margot J Taylor, Elizabeth W Pang
Post-traumatic stress disorder (PTSD) is a mental health injury characterised by re-experiencing, avoidance, numbing and hyperarousal. Whilst the aetiology of the disorder is relatively well understood, there is debate about the prevalence of cognitive sequelae that manifest in PTSD. In particular, there are conflicting reports about deficits in executive function and mental flexibility. Even less is known about the neural changes that underlie such deficits. Here, we used magnetoencephalography to study differences in functional connectivity during a mental flexibility task in combat-related PTSD (all males, mean age = 37...
2015: PloS One
B T Dunkley, L Da Costa, A Bethune, R Jetly, E W Pang, M J Taylor, S M Doesburg
Mild traumatic brain injury (mTBI) occurs from a closed-head impact. Often referred to as concussion, about 20% of cases complain of secondary psychological sequelae, such as disorders of attention and memory. Known as post-concussive symptoms (PCS), these problems can severely disrupt the patient's quality of life. Changes in local spectral power, particularly low-frequency amplitude increases and/or peak alpha slowing have been reported in mTBI, but large-scale connectivity metrics based on inter-regional amplitude correlations relevant for integration and segregation in functional brain networks, and their association with disorders in cognition and behaviour, remain relatively unexplored...
2015: NeuroImage: Clinical
Stephan Moratti, Bryan Strange, Gabriel Rubio
BACKGROUND: Structural and Electroencephalography (EEG) abnormalities in right temporoparietal cortex have been associated with family history of depression (FH). Here we investigate if functional abnormalities in this area, indexed by attenuated responses to emotionally arousing stimuli, are also family-history-dependent. METHODS: Neuromagnetic activity for emotional and neutral complex scenes was recorded by Magnetoencephalography (MEG) in 20 depressed patients without, 8 depressed patients with FH, and 15 healthy controls...
June 1, 2015: Journal of Affective Disorders
Otis Lkuwamy Smart, Vineet Ravi Tiruvadi, Helen S Mayberg
The renaissance in the use of encephalography-based research methods to probe the pathophysiology of neuropsychiatric disorders is well afoot and continues to advance. Building on the platform of neuroimaging evidence on brain circuit models, magnetoencephalography, scalp electroencephalography, and even invasive electroencephalography are now being used to characterize brain network dysfunctions that underlie major depressive disorder using brain oscillation measurements and associated treatment responses...
June 15, 2015: Biological Psychiatry
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